[en] Large number of collective and noncollective states have been observed at lower excitation energies owing to different nuclear shapes across the mass region. For deformed nuclei the nuclear shapes have traditionally been described in terms of β and γ parameters leading to β- and γ- vibrational bands, respectively. The most common low-lying collective vibrational band structure, known as gamma band is extensively reported for different nuclei over decades. Different gamma transitions are observed in nuclei having potentials of different γ-dependencies (triaxial parameter). The shapes of nuclei can be inferred by distinguishing such potentials empirically

[en] The energy level structure of the odd-odd nucleus ¹¹⁴Sb populated in the β /EC decay of ¹¹⁴Te has been studied using the on-line mass separator UNISOR. Improvements on the previous scheme were achieved through multiscaled singles and γ-γ and electron-γ coincidences. The new level scheme will be discussed in terms of multiplets formed by the coupling of single-particle proton and neutron states. Systematic comparisons of neighboring odd-A Sn and Sb and odd-odd Sb nuclei will also be discussed

[en] Lifetimes in ¹¹⁴Te were determined using the recoil distance Doppler-shift technique with a plunger device coupled to five HP Ge detectors enhanced by one Euroball Cluster detector. The experiment was carried out at the Cologne FN Tandem facility using the ⁹³Nb(²⁴Mg,p2n) reaction at 90 MeV. The differential decay curve method in coincidence mode was employed to derive lifetimes for seven excited states, while the lifetime of an isomeric state was obtained in singles mode. The resulting E2 transition probabilities are shown to be very anomalous in comparison with the vibrational energy spacings of the ground state band

No abstract available

[en] The even-even Te isotopes are known to exhibit collective vibrational behaviour at low spin. The structure becomes more complex at higher spin due to the mixing of quadrupole excitations and the evolution of quasiparticle states. M. Grinberg et al. has performed model calculations within the framework of the quasiparticle phonon model (QPM) for Te isotopes with A = 114-130 to explain the collective vibrational quadrupole bands on top of two-particle excitations. In the present work, we have performed shell model calculation for the low-lying states of ¹¹⁴Te by using ANTOINE code, and deduced the transition probability of expected collective states built on the quasiparticle excitations

[en] The nuclear structure of ¹¹⁴Te, which is a vibrational nucleus and obey the SU(5) criterions is given

[en] The nucleus ¹¹⁴Te has been studied in heavy-ion γ-ray spectroscopy experiments performed with the early implementation of the GAMMASPHERE multidetector array. Three rotational intruder bands have been observed up to high spins. The yrast band, involving the 4p2h (h_11/2)²(g_7/2)²(g_9/2)^-2 proton configuration, reaches I=48ℎ at an excitation energy of 30.3 MeV, the highest observed spin connected by γ rays in this mass region. The band properties are interpreted in the framework of smooth band termination

[en] The neutron deficient nuclei near doubly closed shell ( Z=50 and N=50) are subject of considerable interest due to various features such as, shell evolution, transitions in collectivity, magnetic and anti-magnetic rotation. The shell model and its various modified versions have been successfully used for explaining the structures of these nuclei because due to less complex interactions of valance particles near doubly closed shell (Z=50 and N=50) nuclei. Therefore, in present work, shell model calculations have been carried out for neutron deficient "1"0"6"-"1"1"4Te nuclei

[en] The E2 transition strength, B(E2), gives particularly precise information on the competition between the collective and single-particle degree of freedom. An important observable to study the development of collectivity is the B(E2; 4⁺₁ → 2⁺₁)/B (E2; 2⁺₁ → g.s.) (B_4/2). The B_4/2 ratio is usually greater than unity. These values are 1. 4 and 2. 0 for an ideal rotor and a vibrator, respectively. Whereas the seniority scheme usually leads to different behaviours. In this contribution I will show examples that contrast with our standard understanding. The yrast spectra of Te isotopes show a vibrational-like equally-spaced pattern but the few known E2 transitions show anomalous rotational-like behaviour, which cannot be reproduced by collective models. Large-scale shell model calculations reproduce well the equally-spaced spectra of those isotopes as well as the constant behaviour of the B (E2) values in ¹¹⁴Te. For nuclei involving protons or neutrons in j = 9/2 orbitals, the partial conservation of seniority can lead to dramatic changes to the E2 decay pattern that have never been seen before. The B_4/2 ratios in quantum phase transitional nuclei around N = 90 also show a similar exotic feature. (author)

[en] The diversity of structure in neutron-deficient transitional nuclei with A ≈ 115 (52 ≤ Z ≤ 56) has attracted much attention in recent years, as they show variety of structural phenomena, such as, octupole correlation, shape coexistence, γ-vibration and many more due to the alignment of proton and/or neutron in intruder h_11/2 orbitals. In particular, octupole correlation arises when nucleons near the Fermi surface occupies opposite parity orbitals with Δj = Δl = 3. This effect is most prominent in nuclei having N,Z = 34; 56; 88; 136. This mode of excitation will result in a separation between centre of charge and centre of mass of the nucleus, thereby leading to the observation of alternating parity bands, which are connected by strong E1 transitions. Recently, the octupole correlation has been explored in ¹²³Ba and ⁷²Se on the basis of B(E1)=B(E2) ratio and the magnitude of the δE (≈0) between positive and negative parity bands. Neutron deficient Te isotopes having both Z and N close to octupole magic number 56 are good candidates to study this kind of correlation. Consequently, octupole correlation has been reported in ^108-112Te nuclei. In this work, an attempt has been made to search for octupole correlation in heavier ¹¹⁴Te